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You can't post GIFs to Instagram. Most GIFs are very short (less than 3 secs) and are in a different file format than is accepted on Instagram.
GIFstagram turns your GIFs into MP4 files that are of proper length & format so you can post them to Instagram.
GIFstagram: Convert GIFs to Insta-videos
The easiest way to turn GIFs into Insta compatible videos.